Traction-wheel for motor-vehicles.



No. 886,873. PATENTED MAY 5, 1908.

G. H. SCHMIDT.

TRACTION WHEEL FOR MOTOR VEHICLES.

APPLICATION FILED JUNE 4,1907.

' ing to the ED s rens an cam. n. SCHMIDT, or UNTERTURKHEIIVLSTUTTGART, GERMANY, ASSIGNOR ToEoUARn SCIIARRER, OF GANNSTATT, GERMANY.

TRACTION-WHEEL FOR MOTOR- VEHTCLES.

To all whom it may concern:

Be it known that I, CARL H. SCHMIDT, a

citizen of the'German Empire, residing at- Untertu'rkheim-Stuttgart, in the Kingdom of Wiirtemberg, Empire of Germany, have in-. vented certain new and useful-1m rovements in Traction-Wheels for Motorehicles, of which the following is a description, reference being had to the accompanying drawing and to the letters and figures of reference marked thereon.

Although the motor car-industry has made great rogress everywhere, yet these vehicles are 0 y employed to a small extent for agricultural purposes. Especially up to the present such cars could not be employed for instance for motor-plows, which are used fre-v quently with twelve shares, as a suitable substitute for draft-cattle, although it would not offer any difiiculty to the high standing of the present motor-manufacture to construct motors of such a power that the agriever motorpower may be used. For theconstruction of these new wheels I have to some extent utilized the principle of horseshoes. This structure is applied to a wheel in the most simple and most solid mechanical form. For road vehicles there are already known other wheels yet theseare very differ- ..ent from the wheel ofjthe present invention and serve for Y uite other purposes. I

Hitherto, w eels have been constructed with open sides, while in the wheels accordclosed. Hit erto the rims have been made solid and spread soil aside for the purpose of self-cleaning. By the present invention these rims are closed at both sides 'and fulfil the purpose of keeping strong the inlying soil and of pressing it together, so that it forms a resistance, increasing the resistance of the soil, so that a sliding of the wheels is avoided,

. for it would 'not be ossible to fill the rims with strong presse efarth, this escaping Specification of Letters Patent.-

Application filed June 4, 1907.

resent invention the sides are- Patented. May 5, mos. Serial No.- 377,129.

through the inner openings. Furthermore, the weight of road vehicles is too great for employment on loose or sandy soil. For this purpose light motors of high power and great speed are required. Following these prin ciples I have constructed a new wheel suitable for the described purposes. This new wheel is essentially distinguished from the well known tension-wheels by the construc tion of its'running surfaces, hereinafter described and claimed, and illustrated in the accompanying drawings, in which Fi ure 1 s a side elevational view of the whee with a half of the same shown in sec tion. Fig. 2 is an edge elevation in artial section on the line A A of Fig. 1. Fig. 3 is another edge elevation of my improved wheel in artial section on the line B B of Fig. 1 ig 4 is a perspective view. Fig. 5

is an edge view in partial section, showing a modification in the construction. sectional perspective detail view.

Similar characters. of reference designate corresponding parts throughout all the different figures.

In the main form of my invention, illus- Fig. 6 is a trated in Figs. 1, 2, 3, 4 and 6, it will be 'sftfi' that the wheel comprises circular rims or rings 1) I) connected together by the transverse teeth c, and within these rings is an inner spoke-like structure 6 of triangular cross- .section rovided with lateral ribs (1 arranged in a re lal series on both sides of the spokelike structure e ,and extending from the hub to the rims b. The series of outer transverse teeth are as numerous as may be desired, and said teeth effectively join together the two rings I). Said teeth have in the first form of the invention, which is shown in Figs/1, 2, 3, 4 and 6, a rhombic form. They may be more or less acute angled,or rounded ofi, so as to dig easily into the ground. The

rings 6 are preferably formed concavely at their outer edges, as clearly shown in the drawings. With such an arran ement of rings b and teeth c, it will be foundthat the wheels dig more or less into the ground, but the deeperthey penetratethe stronger the resistance will beco e, i'byreason of the entrance of thesiol in o the slots or openings between the narrow inner angles of the faces of the rhombic teeth 6 and the two side rin s b.

he inner s oke-like structure e extends, as already state from the central hub f to the g ceases 1 peripheral teeth :3, as shown very clearly in igs. 2,3 and 6, and may be integral with said teeth if desired.

Also, on each side of the spoke-like structure 6 is a radial series of combination.

The concaved or bevel-shaped rings 7) cause the soil to offer greater resistance, and also revent the wheels from plunging too deep y into the soil. The efiect of the new construction exemplified in my improved Wheel Will be that the soil, and also the sandy land or deserts, will be seized strongly by the more or less broadband large rims of the Wheel and com ressed in some pyramidal form,

' creating't us a strong foothold for the wheels tor power, suc

and permittin' a great efliciency to the moas cannot be obtained with wheels of a different constructi 11.

In the modified form of the; construction delineated in Fig.v 5, the rings b are formed integral with an intermediate section consisting of a circular piece which is a substitute or the teeth 0 and is provided with tapered passages hbeing preferably arranged in airs, the effect thereof beiu substantial y the same in the o eration o' the wheel as that resulting from the use of the series of teeth a. v

As the motor-cars are improved so as to reachsonie hundred horsepower, in spite of a minimum dead or proper weight, of course it is a matter of fact that such new motor Wheels will prove highly useful for the trac-.

3 -.I claim as new and desire to secure by Letters Patent, is:

1. In a traction wheel of theuclass described, the combination of the circular rings a plurality of angular teeth connecting sai rings, a spoke-like structure of angular section within said rings and carrying the hub, and a plurality of radial strengthening ribs at the sides of the spoke-like structure.

2. In a traction wheel of the class described, the combination of a pair of circular rings formed concavely at their outer edges,

a spoke-like structure of angular cross-sea tion within said rings and carrying the hub, and a plurality of'angular teeth connecting the rings, said teeth being separated from each other and adapted to penetrate into the ground to create a strong foothold for the Wheel. v

3.'-In a traction 'wheel of the class described, the combination of a pair of circular rings formed concavely at their outer edges, an inner structure of angular cross-section intermediate between the rings and carrying the hub, a series of angular cross-members connectin said circular rings and connected to the sah i- 4. In a traction wheel of the class described, the combination of the; circular inner structure, said teeth beingseparated from each other and'adapted torings, means connecting themand" roviding openings which receive the groun between them, an inner spoke-like structure carrying the hub and connected to' the rings, and'a series of strengthening radial ribs on each side'of said inner structure.

5.-'In a traction Wheel of the class described, the combination of a pair of circular rings, means connecting them and providing teeth to' engage the surface over which the wheel travels, an inner spoke-like structure .of angular-cross-section carrying the central hub and connectedto the circular rings, and radial ribs at eachside of said inner structure. In-testimon reof I aifix my signature, in presenceo t Witnesses.

.CA-RL SCHMIDT.

Witnesses: Y r

HERMANN H rns, JEAN GULDENZ, 

